1914] Grinnell: Mammals and Birds of fhr Colorado VaUci/ 141 



The inference is that the nuttaUi of the Colorado Valley are winter 

 visitants from the Great Basin region. That these, however, are 

 identical with typical nuttaUi. described from South Dakota (accord- 

 ing to A. O. U. Check-List, 1910, p. 197), is problematical. I have 

 had no opportunity for comparison of relevant material. Neither is 

 there assurance that the Colorado Valley nitidus is typical of the 

 form bearing that name and described from the Nueces River, 

 southern Texas (Brewster, 1887, p. 147). In the original description 

 of the latter, restriction of dark markings and general paleness are 

 emphasized characters, which ai-e in accord with the Colorado Valley 

 nitidus. Ridgway (1887, p. 588) adds the character of small size. 

 The difference in facial mottling, mentioned by both of the authors 

 just cited, is not clearly in evidence in the Colorado Valley material. 



It is to be remarked that Fhalaenoptilus nuttaUi californicus, repre- 

 sented by specimens from central and southern California west of the 

 desert divide, is well differentiated from both of the forms here pointed 

 out. Three races of the poor-will thus occur within the state of Cali- 

 fornia, and as there are good grounds for believing that P. n. luitiaUi 

 summers east of the Sierran divide in northea.stern California, all 

 three probably breed within the limits of the state. 



In this connection sixty-seven adult-plumaged poor-wills have been 

 examined. 



LIST AND DIMENSIONS IN MILLIMETERS OF FHALAENOPTILUS XVTTALLI 

 NVTTALLI FROM THE COLORADO VALLEY 



No. Sex Locality 



12780 c^^ Riverside Mt., Calif, side 



12785 J' Opposite Cibola, Calif, side 



12791 J' S mi. E. Picacho, Calif, side 



12777 c? Chemehiievis Val., Calif, side 



12788 c^ 10 mi. S. Cibola, Ariz, side 



12783 (^ Ehrenberg, Ariz, side 



Average of the males, 



12790 $' S mi. E. Picacho, Calif, side 



12789 5 20 mi. N. Picacho, Calif, side 



12784 5 Opposite Cibola, Calif, side 

 12779 9 Riverside Mt., Calif, side 

 12776 5 Chemehuevis Val., Calif, side 

 12793 2 5 mi. N. Laguna, Ariz, side 



Average of the females 

 Average of the 12 specimens 



' Dissection showed reproductive organs to be inactive. 



